Propeller.



A. E. MILLER.

PROPELLER.

APPLICATION FILED NOV. 21. 1914.

1,154,649. PatentedSept. 28, 1915.

aw/knew Mw- MW?- b2. 1%!- COLUMBIA PLANDGRAPH CO..WASHINGTON. u rvANTHONY E. MILLER, OF DETROIT, MICHIGAN.

PROPELLER.

Application filed November 21, 19114.

To all whom it may concern Be it known that I, ANTHONY E. MILLER, acitizen of the United States, residing at Detroit, in the county ofVfayne and State of Michigan, have invented certain new and usefulImprovements in Propellers, of which the following is a specification,reference being had to the accompanying drawings.

This invention relates to propellers and the primary object of myinvention is the provision of a propeller in which the blades may beadjusted so as to secure any desired pitch thereby adapting thepropeller to be used with any horse-power up to its limit.

A. further object of the invention is to provide a very simple propellerstructure including a head in which the blades are rotatably mounted,and means whereby the blades may be held in their adjusted positions.

A further object is to provide means whereby the blades may be ad usted1n exact relation with each other so that both of the blades will haveexactly the same pitch,

whatever that pitch may be.

Further objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings wherein,

Figure 1 is a face view of my adjustable propeller; Fig. 2 is atransverse section on the line 2-2 of Fig. 1; Fig. 3 is a section on theline 33 of Fig. 2.

Corresponding and like parts are referred to in the followingdescription and designated in all parts of the accompanying drawings bylike reference numerals.

Referring to these figures, it will be seen that the blades are mountedupon a head 2 which is solid except for the bores 3 extendingtransversely through the head for the reception of the shanks of thepropeller blades and the bore 4: which extends transversely through thehead at right angles to the bores 3 and which is for the reception ofthe propeller shaft (not shown). This bore 4. is surrounded on one faceof the head with an outstanding flange 5. Each propeller blade is formedwith a body portion 6 forming the blade proper, and with a reduced shank7 having a diameter just equal to the diameter of one of the bores 3into which the shank is to be inserted. At the base of the shank, theblade is formed with a sector plate 8 having a series of arcuatelydisposed Specification of Letters Patent.

Patented Sept. 28, 1915.

Serial No. 873,350.

teeth upon its edge. The extremity of the shank extends through the head2 and is screw threaded upon its exterior end for the reception of thenut 9. The propeller blade is held in its adjusted position by means ofthis nut 9 and also by means of a set screw 10 which extends throughfrom the face of the head and engages the shank of the propeller. Ofcourse, in the case of one of the propeller blades, the sector plate 8must be disposed upon the same end of the shank 3 as the nut 9 andhence, in this case, the blade is shouldered as at 11 to bear againstthe face of the head, and the reduced end of the shank is formed with alug 12 formed by inserting a pin longitudinally of the shank so that thepin will project beyond the circumference of the reduced portion of theshank. The sector plate is, of course, formed with a central opening 13through which the shank passes and with a radially extending notch 14 inwhich the pin or lug 12 is received, thus holding this sector platesecurely in engagement with the shank for unitary rotation. In the otherblade, the sector plate is held adjusted with relation to the shank bymeans of a pin 15 driven through the sector plate and into the base ofthe blade.

It will be seen now that the blades may be adjusted to any desired angleor pitch by loosening the set screws 10 and loosening the nuts 9 andthen rotating the blades. The sectors will, of course, cause a reverserotation of the blades but the rotation of one blade a predeterminedangular extent will, of course, cause a rotation of the other blade toan exactly similar extent. After the desired pitch has been obtained,the nuts 9 are tightened and the set screws 10 again inserted and thewheel is ready for use. In case a. left hand wheel is wanted, the bladesmay be transposed or reversed in the head 2 which will permit thepropeller to be r0- tated in an opposite direction.

Having described my invention, what I claim is 1. An adjustablepropeller comprising a head adapted to be attached to a driving shaftand having transversely extending bores, oppositely disposed propellerblades having shanks insertible into said bores and rotatable therein,gears mounted each on one of the shanks and inter-meshing with eachother whereby to communicate the rotation loo of one blade to the otherblade, and means for holding the blades set in any rotatably adjustedposition. a

2. An adjustable propeller comprising a head adapted to be attached to adriving shaft, oppositely disposed propeller blades having shanksrotatably mounted in said head whereby the blades may be rotated upontheir longer axes, interineshing sector gears fixedly mounted upon saidshanks, and set screws passing through the head engaging the shanks andholding the blades in their angularlyadjusted positions.

3. An adjustable propeller comprising a head adapted to be attached to adriving shaft and having transversely extending bores, oppositelydisposed propellers having reduced shanks insertible into said bores androtatable therein, sector gears mounted on the shanks and intermeshingWith each other, nuts engaging the ends of the shanks and bearingagainst the head, and set screws holding the shanks in their adjustedpositions. M

In testimony whereof I hereunto aflix my signature in the presence oftwo Witnesses. ANTHONY E. MILLER. Witnesses:

EDWARD T. FoeAn'rY, VVILLIAM R. MILLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G.

